Denso HP4 294050-0123 High-Pressure Pump – Complete Technical Guide with HP4 vs HP3 Comparison
The Denso HP4 294050-0123 functions as a second-generation medium-duty common rail high‑pressure pump that Denso specifically engineered for Isuzu 4HK1 and 6HK1 diesel engines. Unlike the Denso HP3’s two-plunger design, the HP4 features three plungers positioned at 120° intervals, providing approximately 1.5 times higher fuel delivery capacity than the HP3 while maintaining a maximum system […]
